First of all, I am answering your questions with the assumption there is a shower above this tub. YES or NO?
Questions that I have:
How do I best remove the mold off the ceiling and on the side of the bathtub where it meets the drywall? Any sealants/protectors that you can recommend?
Don't try to save moldy drywall. Replace it.
Are the plastic wall panels usually glued down on top of drywall?
Possibly. They may be over drywall, they may be attached directly to the studs. Don't know til you get there.
When I take down the panels, if there is water damage, should I replace all of the drywall around the bathtub?
No drywall in wet areas. Outside of the shower area replace the drywall. Inside a wet area, use some sort of CBU.
For the tiling, do I even need the drywall? Or can I rip it down to studs and just slap cement backerboard on it for the tiles?*
A bit more complicated than that, but yes, use CBU.
When I do this, do you recommend taking out the bathtub completely? Especially if there is water damage?
Usually not necessary unless you have major water damage. If you are planning on keeping the same tub, leave it in place.
What is your advice to ensure very good moisture proof and waterproof renovation, when it comes to tiling around the bathtub?
There are several methods of waterproofing a wet area. CBU with Redgard or similar roll on waterproofing is one of the more popular (and less expensive) ways to go. There are others. Schluter-Kerdi is arguably the best, but you pay for it.
FYI, you want to be specific when you say "around the bathtub". Do you mean above the tub in the wet area, or do you mean outside of the tub and wet area where you just may get an occasional splash?
Last edited by Blondesense; 04-25-2012 at 02:06 PM.